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Finding the Fourth Proportional to 449.06, 619.20 and 387.09

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Solution

The fourth proportional to 449.06, 619.20 and 387.09 is: 533.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.06 : 619.20 = 387.09 : x
  2. Step 2: Convert to fraction form
    449.06/619.20 = 387.09/x
  3. Step 3: Cross multiply
    449.06x = 619.20 × 387.09
  4. Step 4: Simplify right side
    449.06x = 239,686.13
  5. Step 5: Solve for x
    x = 239,686.13/449.06
  6. Step 6: Final answer
    x = 533.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.